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Container","main_nested","877549aa-8bc7-474b-8261-ce43bdf39dfd",[67,83],[68,73],{"colSpan":57,"colSpanSM":69,"colSpanMD":70,"colSpanLG":71,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderColor":7,"borderRadius":7,"classes":7,"id":72,"borderPosition":7},"sm:col-span-6","md:col-span-6","lg:col-span-6","f5aab5dd-4d72-423a-87fb-ae305112af49",{"name":74,"componentName":75,"group":76,"margin":7,"padding":7,"classes":7,"bgImage":7,"id":77,"originalModel":78},"WYSIWYG Editor","Wysiwyg","content","ee86e31b-348d-41ae-aea6-b0a20400b9d2",{"proseEnabled":8,"content":79,"lineHeightClass":80,"trackingClass":81,"spacingClass":82},"\u003Ch1 class=\"text-4xl md:text-5xl text-theme-dark-green font-medium mb-10 md:mb-0\" style=\"text-align: left;\">Passivhaus Airtightness Test Success: n50 0.38 Achieved on Final Blower Door Test\u003C\u002Fh1>","leading-relaxed","tracking-normal","[&_p]:my-0 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class=\"et_pb_column et_pb_column_2_3 et_pb_column_2_tb_body  et_pb_css_mix_blend_mode_passthrough\">\n\u003Cdiv class=\"et_pb_module et_pb_post_content et_pb_post_content_0_tb_body\">\n\u003Cdiv>\n\u003Cdiv class=\"___14mo4og f22iagw fz7g6wx f1vx9l62 fly5x3f f10pi13n f1sil6mw\">\n\u003Cdiv class=\"fui-FluentProvider fui-FluentProviderrg5 fai-CopilotProvider fai-next ___owmohu0 f19n0e5 f1k92xex f1o700av fk6fouc fkhj508 figsok6 f1i3iumi f22iagw f1vx9l62 f1g2tzg5 fprs0cq\" dir=\"ltr\">\n\u003Cdiv id=\"llm-web-ui-messageList-scrollable-container\" class=\"___38pbjd0 fnuphcs fz7g6wx f22iagw f5zp4f f1a3p1vp f1gkdon0 fly5x3f fi4v0vl fuifxsz\">\n\u003Cdiv data-testid=\"MessageListContainer\" class=\"___1c7m3kc fdclmfp f18gn6m8 fhlp1w2 f13lr3k6 f12uvujy f19rqxuy fx0jucd f1ee5qza fumlgkt f22iagw f1vx9l62 fsbu5mz fbhxue7 f1p9o1ba f5zp4f fz7g6wx f10dj2a6 fifp7yv f1xrhkku f148y75e\">\n\u003Cdiv role=\"feed\" class=\"fai-CopilotChat ___1gx857g f22iagw f1vx9l62 f1sff6ri f1l02sjl fz7g6wx\" data-tabster=\"{"mover":{"cyclic":false,"direction":1,"memorizeCurrent":true,"hasDefault":true}}\">\n\u003Cdiv class=\"fui-Virtualizer-Scroll-View-Dynamic__container ___p7ill80 f22iagw fly5x3f f1l02sjl f1ngn1p8 fxcusd5 f1vx9l62 f5zp4f f1115ve7\">\n\u003Cdiv data-virtualizer-index=\"18\" data-rendered-index=\"2\">\n\u003Cdiv class=\"___s8rc500 f22iagw f1vx9l62 f336tjw fkfq4zb fwbpcpn f5i1nj6 fod5ikn f1c88k3p fnl8v5d f901tiz f200zcz f1iczoe4 f3rmtva fcgxt0o f1ujusj6 f1ewtqcl f1ajdyiu fgfkb25 fly5x3f f1c5fvqg f15colsn f1w1u1t3 f1f7w013 f1jrcihw f3qt22i f14zl8uf fzt02m6 f1yzny4 ffk92mm fvqq9m5 fc1vqcz f5tv5m0 f4tfpe5 faumaof f1xwwely fmjujva fkqvoc2 f1x26jzp f196fjp3 f39srb5 f1kuloo6 f6c99af fz7g6wx m365-chat-llm-web-ui-chat-chat-message chat-message-scroll-target-index\" id=\"chatMessageContainerr2o8\" data-testid=\"m365-chat-llm-web-ui-chat-message\" data-message-index=\"18\">\n\u003Cdiv class=\"___1mi8yjl f22iagw fz7g6wx\">\n\u003Cdiv class=\"___kgn7g00 f22iagw f1vx9l62 fpgzoln fh8aql4 f1wvei1u f6c99af fz7g6wx fly5x3f\" data-testid=\"copilot-message-div\">\n\u003Cdiv class=\"___19ip04d f1s184ao f6c99af\" role=\"\" dir=\"auto\" data-testid=\"copilot-message-reply-div\" tabindex=\"-1\">\n\u003Cdiv role=\"article\" aria-labelledby=\"copilot-message-r2og-title copilot-message-r2og\" data-tabster=\"{"groupper":{"tabbability":2},"focusable":{}}\" aria-busy=\"true\" name=\"[object Object]\" class=\"fai-CopilotMessage r1f6yzd6 ___1fjo9g7 f1g2tzg5 fgct6un fy77jfu f2c7lf3\" tabindex=\"0\">\n\u003Cdiv dir=\"auto\" id=\"copilot-message-r2og\" class=\"fai-CopilotMessage__content r1izxv8h ___7qar2c0 fcthzvy\">\n\u003Cdiv>\n\u003Cdiv dir=\"auto\">\n\u003Cdiv class=\"___1vve6yh f22iagw f1vx9l62 f122n59 f3bhgqh f1mnxvew fly5x3f\">\n\u003Cdiv class=\"___j4vmuw0 f22iagw f1vx9l62 f1869bpl fly5x3f fbc6vix\">\n\u003Cdiv data-testid=\"loading-message\" data-fui-focus-visible=\"\" tabindex=\"-1\">\n\u003Cdiv>\n\u003Cdiv id=\"chatMessageResponse-c56167eb-d82f-4585-ad5f-064e2fbfd4eb\" class=\"___1yop6mf f336tjw f9ijwd5 fz7g6wx fod5ikn f1s184ao\">\n\u003Cdiv dir=\"auto\" aria-hidden=\"true\" class=\"___1j4t0a1 f1lmfglv f1abmfm4\" data-testid=\"markdown-reply\" data-message-type=\"Chat\">\n\u003Cdiv class=\"___o3t5a50 f22iagw f1vx9l62 f1i1t7jz fk15e71 f1k953kz f137keqj f1rncccw f1stllg3 f1w4kmmc f1tric3v f10dk5ic fx8cdsv f16nlwsl f1eookvz fhjrts3 fqugt2f f10km5jb f18d18k8 f1v1vhmp f1hdmul3 f198vjnp f2dshw1 fjpjndq fnmj2pj ffrrb40 f1mon110 fhajzam fimndk6 fxv4dng fb1rn9k f59wlhv f1xmfh30 f18yf5o5 fmr6chf fw8qy2q ff161sd f1qr7t77 f1yyogn1 foogchg fp5872b f1tpb8gf f1hdgrc8 f1vatr43 frkxccd f9pdzkb f158oiaz ft5kggy f5l4ui7 f13j03li f18xdoka f8off4e f1go6zfc f128n2ra f1jpxw2j f1lwd9n0 fy0b8hm f1g2633v fx4kvgi fkvolse f1gxrt3a f1os76ua f1js9cnw f1g87ej0 freluf8 f1yggaq6 f2i3chp f1151osp florpoh f35kzfz ftp9m57 f1e288vi fz62hnz fixvuys f1nmofwh fc1c6mv f18a2er7 fhvkrdl fhxnn68 f1oce4bo fvhlfan f7tc0t0 f1ngf1n2 ffrzq6x f1yjiq2m f1aqdgql f1huvaf f10ij78l f1k94sa4 fkmfumq f1jvzkyl f1eu24ob f1xbfc1f fmf0lwf f107dsy8 f3w566c f4648sl f13zpkng f7unjfp f8p1rz fzu6h1w f1i1bi6h f1smo7hi f1sk1xod f1kgogdq f1gjktkp ft608jz f19dd9cz fg3xr24 fhd155k f1b8gl2e fg4b9ou flb4lo fdicbfk fgwcyh1 f1jbds0d f1fb9uea f1stuka4 fcrtu6g fwqh0xn f11w66yg f6e0e65 f1vvgu0 f1607507 f1m9bycv f1ntoah8 f1b694rt faql4r2 fpjuhzh fmavl6h f1d9bsk fmzhlt0 f145l92p fwkyaqm f129obh1 f19la9g f127w39w fr0ux9m fxhidck f1cu4h9j f1wnbo7v f1eueg4z fy9c24f f1h2o91j f1iw08fq\">\n\u003Ch2>\u003Cstrong>The Result\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>A Passivhaus home achieved \u003Cstrong>n50 0.38\u003C\u002Fstrong> on the final blower door test, comfortably inside the 0.6 n50 certification limit. ATSPACE supported the project with Passivhaus air leakage testing, leak finding, and a practical close‑out plan that maintained airtightness continuity through the most complex junctions. Certification evidence was delivered without disruption or retest pressure.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Project Snapshot\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Service:\u003C\u002Fstrong> Passivhaus air leakage testing\u003Cbr>\u003Cstrong>Client:\u003C\u002Fstrong> Developer‑led self‑build & principal contractor partnership\u003Cbr>\u003Cstrong>Site:\u003C\u002Fstrong> Cedar View House, 18 Fernbank Lane, Hebden Bridge HX7 6QT\u003Cbr>\u003Cstrong>Building type:\u003C\u002Fstrong> Single dwelling (Passivhaus intent)\u003Cbr>\u003Cstrong>Construction:\u003C\u002Fstrong> Timber frame, wood fibre insulation, airtight membrane + tapes, MVHR\u003Cbr>\u003Cstrong>Programme stage:\u003C\u002Fstrong> Final finishes complete, certification window\u003Cbr>\u003Cstrong>Performance target:\u003C\u002Fstrong> n50 ≤ 0.6\u003Cbr>\u003Cstrong>ATSPACE delivery:\u003C\u002Fstrong> Readiness check, diagnostic leak finding, final blower door test, certification‑ready reporting\u003Cbr>\u003Cstrong>Engineers:\u003C\u002Fstrong> ATSPACE airtightness engineer + compliance coordinator (no names published)\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Why This Was High Risk (Even on a Good Build)\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Passivhaus failures rarely happen due to poor workmanship — they happen when details slip late in the programme.\u003C\u002Fp>\n\u003Cp>Three real‑world risks affected this project:\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>1. Multiple airtightness layers converging at junctions\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Membranes, tapes, window interfaces, internal services and plant penetrations must all align perfectly. Continuity is the challenge.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>2. Late penetrations\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Even small late changes (data runs, kitchen tweaks, electrical changes, MVHR adjustments) can reopen sealed layers.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>3. Complex service zones\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Plant rooms and utilities contain dense penetrations and overlapping trades — a known Passivhaus weak point.\u003C\u002Fp>\n\u003Cp>The client wanted \u003Cstrong>margin\u003C\u002Fstrong>, not a borderline pass.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What a Passivhaus Airtightness Test Measures\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>A Passivhaus blower‑door test reports \u003Cstrong>n50\u003C\u002Fstrong>, meaning air changes per hour at 50 pascals.\u003C\u002Fp>\n\u003Cp>In simple terms:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Lower n50 = less uncontrolled air leakage\u003C\u002Fli>\n\u003Cli>Passivhaus requires \u003Cstrong>n50 ≤ 0.6\u003C\u002Fstrong>\u003C\u002Fli>\n\u003Cli>A lower result provides greater confidence in long‑term airtightness performance\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>ATSPACE focuses on airtightness \u003Cem>as built\u003C\u002Fem>, not just airtightness \u003Cem>on test day\u003C\u002Fem>.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What ATSPACE Was Asked to Do\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The project team asked ATSPACE to:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>verify the home was genuinely ready for certification testing\u003C\u002Fli>\n\u003Cli>identify & prioritise leak routes affecting the final n50\u003C\u002Fli>\n\u003Cli>support practical close‑out\u003C\u002Fli>\n\u003Cli>deliver the final blower‑door test & certification‑ready reporting\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>What ATSPACE Did On Site\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Step 1: Pre‑test readiness check\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We walked the entire airtightness line, focusing on typical Passivhaus risk areas:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>window & door tapes\u002Freturns\u003C\u002Fli>\n\u003Cli>service penetrations in the membrane\u003C\u002Fli>\n\u003Cli>loft\u002Fceiling penetrations\u003C\u002Fli>\n\u003Cli>plant room ductwork & pipework\u003C\u002Fli>\n\u003Cli>thresholds & balcony interfaces\u003C\u002Fli>\n\u003Cli>meter\u002Fservice entries\u003C\u002Fli>\n\u003Cli>airtightness continuity behind kitchens\u002Futility zones\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>We also confirmed test conditions to avoid surprises on test day.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 2: Diagnostic leak finding under controlled pressure\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>With the building under pressure, we traced airflow at the highest‑risk interfaces, ranking findings by:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>impact on n50\u003C\u002Fli>\n\u003Cli>access difficulty\u003C\u002Fli>\n\u003Cli>likelihood of recurring\u003C\u002Fli>\n\u003Cli>robustness of proposed fix\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>\u003Cstrong>Step 3: Close‑out plan with clear ownership\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>To prevent issues bouncing between trades, the plan included:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>exact leak location\u003C\u002Fli>\n\u003Cli>why it mattered\u003C\u002Fli>\n\u003Cli>what “good” looks like\u003C\u002Fli>\n\u003Cli>which trade owned the fix\u003C\u002Fli>\n\u003Cli>what required rechecking\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>\u003Cstrong>Step 4: Verification check before the test\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We rechecked key areas after close‑out to protect the final test slot.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 5: Final blower‑door test & certification reporting\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We completed the final test under controlled conditions and issued certification‑ready evidence.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>The Issues We Found (That Could Have Risked the Result)\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Issue 1: Plant room penetrations\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>A few pipe\u002Fcable routes were sealed but not as a continuous airtight layer.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Why it matters:\u003C\u002Fstrong> Plant rooms accumulate leakage quickly.\u003Cbr>\u003Cstrong>Fix:\u003C\u002Fstrong> Reinstate continuous airtight layer behind collars\u002Ftrims.\u003C\u002Fp>\n\u003Chr>\n\u003Ch3>\u003Cstrong>Issue 2: Window return transitions\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Most window tapes were excellent; a few transitions had minor discontinuities.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Why it matters:\u003C\u002Fstrong> Window perimeters are long junction lines.\u003Cbr>\u003Cstrong>Fix:\u003C\u002Fstrong> Reinstate tape continuity and ensure correct substrate bonding.\u003C\u002Fp>\n\u003Chr>\n\u003Ch3>\u003Cstrong>Issue 3: Ceiling service penetrations\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Inconsistent sealing approach at some penetrations.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Why it matters:\u003C\u002Fstrong> Ceiling paths can connect to large voids and amplify 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window\u003C\u002Fli>\n\u003Cli>close‑out plans with clear trade ownership\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Frequently Asked Questions\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>What is the Passivhaus airtightness limit?\u003C\u002Fstrong>\u003Cbr>n50 ≤ 0.6.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>When should we book the final test?\u003C\u002Fstrong>\u003Cbr>When the airtightness line is complete and protected — ideally after a readiness check.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Why do Passivhaus projects fail airtightness?\u003C\u002Fstrong>\u003Cbr>Interface issues: penetrations, window returns, thresholds, plant\u002Futility zones.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Can diagnostic testing improve the final n50?\u003C\u002Fstrong>\u003Cbr>Yes — by finding the leak routes that materially affect the 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